I love Vital Cat Food! Our 18 year old cat, Gracie, has been a picky eater all her life. In the past year, she has had some health problems and lost weight due to age. I started feeding her your cat food about 4 months ago. There was no "transition period" needed; Gracie went for the food right away and eats it all up every time. Her digestion is better, she seems more healthy and energetic, and has even gained 2 pounds of weight back. I now feed our two younger cats the Vital too. Thanks for making such a high quality product. We can see the difference this food makes in our cats and I'm so glad to have found a premium brand of food that they actually love to eat!